kenotron

# I just add these as steps as tasks inside a VSTS build def
npm set always-auth
npm set email xxxx@yyyy.com
...

# Caveats:
# 1. now your npm config is DIRTY globally - only one of these creds can be active at a time
# 2. VSTS has a notion of "secure variable" that can be exposed env variables (write only) not sure if Jenkins has similar feature